View Item 
      •   Home
      • 1. Schools
      • College of Engineering
      • School of Materials Science and Engineering (MSE)
      • MSE Journal Articles
      • View Item
      •   Home
      • 1. Schools
      • College of Engineering
      • School of Materials Science and Engineering (MSE)
      • MSE Journal Articles
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      Subject Lookup

      Browse

      All of DR-NTUCommunities & CollectionsTitlesAuthorsBy DateSubjectsThis CollectionTitlesAuthorsBy DateSubjects

      My Account

      Login

      Statistics

      Most Popular ItemsStatistics by CountryMost Popular Authors

      About DR-NTU

      Demonstration of high-resolution capability of chemical force titration via study of acid/base properties of a patterned self-assembled monolayer

      Thumbnail
      Author
      He, Hui-Xin
      Huang, Wei
      Zhang, Hua
      Li, Qi Guang
      Li, Sam Fong Yau
      Liu, Zhong-Fan
      Date of Issue
      2000
      School
      School of Materials Science and Engineering
      Abstract
      An experimental approach for probing the resolution of chemical force titration is reported here. A self-assembled monolayer (SAM) patterned with COOH and CH3 groups was used as the model surface, and its local dissociation property was studied by both chemical force titration and contact angle titration. The dissociation constant (pK1/2) estimated by chemical force titration was found to be sensitive to the surface location. In the COOH region, chemical force titration gave a pK1/2 value of 5.4, identical with the value obtained on a pure, unpatterned COOH SAM, while in the CH3 region, the force curves varied greatly from site to site even in the same pH solution, indicating the mixed film nature being originated from the microcontact printing process. In contrast, contact angle titration generates a fixed pK1/2 value of 11.0 on the patterned surface, completely different from the force titration results. This study demonstrates that chemical force titration indeed has a spatially resolved capability, with a lateral spatial resolution of better than 1 μm, and is more effective for detecting the local properties of chemically inhomogeneous surfaces.
      Subject
      DRNTU::Engineering::Materials
      Type
      Journal Article
      Series/Journal Title
      Langmuir
      Rights
      Copyright © 2000 American Chemical Society.
      Collections
      • MSE Journal Articles
      http://dx.doi.org/10.1021/la990021a
      Get published version (via Digital Object Identifier)

      Show full item record


      NTU Library, Nanyang Avenue, Singapore 639798 © 2011 Nanyang Technological University. All rights reserved.
      DSpace software copyright © 2002-2015  DuraSpace
      Contact Us | Send Feedback
      Share |    
      Theme by 
      Atmire NV
       

       


      NTU Library, Nanyang Avenue, Singapore 639798 © 2011 Nanyang Technological University. All rights reserved.
      DSpace software copyright © 2002-2015  DuraSpace
      Contact Us | Send Feedback
      Share |    
      Theme by 
      Atmire NV
       

       

      DCSIMG